Two field-emission states of single-walled carbon nanotubes
Two field-emission states of single-walled carbon nanotubes
复制标题
DOI：
10.1063/1.1361089
复制
发表时间：
2001-03
影响因子：
4
通讯作者：
R. Collazo;R. Schlesser;Z. Sitar
中科院分区：
文献类型：
--
作者：
R. Collazo;R. Schlesser;Z. Sitar
根据单壁碳纳米管各自的发射电流水平，确定了两种场发射状态。产生增加的发射电流的状态归因于纳米管上吸附物的存在。人们认识到，通过施加高电场，产生大的发射电流，可以诱导两种状态之间的转变。对于高电流状态，场发射电子起源于低于费米能级1 eV的状态，这是由场发射能量分布测量确定的。这表明吸附剂在表面上引入了共振状态，从而提高了电子的隧穿概率。当应用一个大电场清洗纳米管时，这些状态被去除，从而减少场发射电流。
Two field-emission states of single-walled carbon nanotubes have been identified according to their respective emission current levels. The state yielding increased emission current has been attributed to the presence of adsorbates on the nanotubes. It was realized that, by application of high electric fields inducing large emission currents, a transition between the two states could be induced. For the high current state, field-emitted electrons originated from states located 1 eV below the Fermi level, as was determined by field-emission energy distribution measurements. This suggested that adsorbates introduced a resonant state on the surface that enhanced the tunneling probability of the electrons. These states are removed when the nanotubes are cleaned by application of a large electric field, thus, decreasing the field-emitted current.